990684783 has 32 divisors (see below), whose sum is σ = 1638362880. Its totient is φ = 586444320.

The previous prime is 990684743. The next prime is 990684791. The reversal of 990684783 is 387486099.

It is not a de Polignac number, because 990684783 - 2¹⁶ = 990619247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990684703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26016 + ... + 51557.

It is an arithmetic number, because the mean of its divisors is an integer number (51198840).

Almost surely, 2^990684783 is an apocalyptic number.

990684783 is a deficient number, since it is larger than the sum of its proper divisors (647678097).

990684783 is a wasteful number, since it uses less digits than its factorization.

990684783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77636 (or 77630 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 990684783 is about 31475.1454802039. The cubic root of 990684783 is about 996.8852359847.

The spelling of 990684783 in words is "nine hundred ninety million, six hundred eighty-four thousand, seven hundred eighty-three".